My complaint:
I sent a delivery next day. I posted it about 1pm on a Tuesday. It arrived Saturday morning.
I accept than 1pm might have been too late for Wednesday but then surely Thursday or Friday.
Complaining is impossible. The bot refuses to do anything as the parcel has been delivered. The phone line can’t find the parcel so refuses to do anything.
There is no mechanism of explaining what the situation is and it is not good enough. I accept that I have wasted more time on this than it cost to send next day delivery but I do not think it is acceptable for a company to get away with this shoddy service and not have the decency to admit it.
They are hiding behind poor systems probably because they are inundated with complaints that they can’t cope with.
Suggested solution:
At minimum they need to refund the extra cost but in reality if they ever want me to consider using them again the gesture is going to have to be a lot bigger.

